This is not a known issue. The logic to update the Delphi library path has been the same since we updated our installer for RB 11 (8 years ago).

I'm guessing there is a special case where this occurs with your specific setup/machine however isolating it may be troublesome as we are unable to recreate it here (with the default install location).

One option is to use the library path combobox to restore a previously saved library path in the Delphi options.